Donald Trump Won't Condemn KKK, Says He 'Knows Nothing About White Supremacists' : The Two-WayOn CNN's State of the Union, the Republican front-runner was asked if he'd distance himself from the support of former KKK grand wizard David Duke. Trump refused four times, saying, "I don't know."

Republican presidential candidate Donald Trump signs autographs for supporters at the conclusion of a rally at Millington Regional Jetport on Saturday in Millington, Tenn.

Michael B. Thomas/AFP/Getty Images

On the Sunday morning talk shows, Republican presidential front-runner Donald Trump refused to condemn endorsements from a prominent white supremacist and former KKK leader, and said he retweeted a Mussolini quote because "it's a very good quote."

Trump refused to condemn that endorsement or say he didn't want the support of white supremacists — four times.

"I don't know anything about David Duke. I don't know what you're even talking about with white supremacy or white supremacist. I don't know. I don't know, did he endorse me, or what's going on?" he said. That prompted a back-and-forth that went, in part:

Trump: I don't know what group you're talking about. You wouldn't want me to condemn a group that I know nothing about. ... If you would send me a list of the groups, I will do research on them and certainly I would disavow them if I thought there was something wrong.

Tapper: The Ku Klux Klan?

Trump: You may have groups in there that are totally fine and it would be very unfair. So give me a list of the groups and I'll let you know.

Also on the Sunday show circuit, on NBC's Meet the Press, Trump declined to distance himself from a Benito Mussolini quote he had retweeted.

Gawker has since posted to announce that the account that first tweeted the quote — unsubtly named "@ilduce2016" — was a bot they designed with the express purpose of tricking Trump into retweeting a line from the fascist Italian dictator.